Which retail innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than asking clerks behind counters?

Test your knowledge about the fascinating history of retail! Long before online shopping and self-checkout, retail was undergoing revolutionary changes that shaped how we shop today. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Can you identify this groundbreaking retail innovation from the early 20th century?

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The self-service grocery store (Piggly Wiggly)
The department store credit card system
The mail-order catalog with home delivery
The shopping mall with multiple stores under one roof